The 800 series is the beefier Saginaw family, and this is Howe's I/F, 4-bolt version built on the box you send. Howe lists it under Chevy for pre-runner, desert race and stock car builds.
The asterisk on Howe's price list means you provide the box, new or reman, and Howe builds it up for you. Howe sets its Saginaw boxes up to stop internally when the ram and spindle stop, so you'll mark the box for internal stops using Howe's instructions and leave the pitman arm on afterward. Howe also says it builds with all-new, zero-mile parts, nothing remanufactured.
Howe Performance part number 515.